IRON(II)-PYRAZINE COMPLEX WITH IODIDE AND TETRACHLOROPALADATE(II) ANIONS

• Main Author: Fandriansyah, Alfan
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/83050
• Institution: Institut Teknologi Bandung

Iron(II) complexes with nitrogen atom donor ligands have attracted the attention of many researchers because they can exhibit different magnetic characteristics such as paramagnetic, diamagnetic, and sometimes both. Additionally, the formed complexes can have diverse structures ranging from simple mononuclear complexes to complexes with polymeric structures. Iron(II)-pyrazine (pz) complexes with sulfate anions have been reported to be mononuclear complexes with the formula [Fe(pz)(H2O)5]SO4, but with iodide, I?, Fe(pz)2(I)2 is formed, and with tetracyanoplatinate(II), Pt(CN)42?, Fe(pz)[Pt(CN)4] is formed. Pyrazine is an organic ligand with a heterocyclic aromatic structure and has two nitrogen atoms in para positions, allowing it to potentially replace water ligands in iron(II) complexes. This ligand can also act as a bridging ligand, forming polymeric structure complexes. In this study, iron(II) tetrafluoroborate was used as raw material, but solid iron(II)-pyrazine complexes with tetrafluoroborate anions were not successfully isolated, so anion exchange methods were performed in solution, namely exchanging tetrafluoroborate anions with iodide and tetrachloropaladate. The resulting complex compounds were reddish-colored powders. Elemental analysis showed that the two complex compounds have the molecular formula [Fe(pz)(H2O)5]I2 and [Fe(pz)2(H2O)2]PdCl4.4H2O respectively. The results of XRD analysis showed that the complex [Fe(pz)(H2O)5]I2 has higher crystallinity than the complex [Fe(pz)2(H2O)2]PdCl4.4H2O. The complex [Fe(pz)(H2O)5]I2 tends to be paramagnetic with a magnetic moment of 4.26 BM, while the complex [Fe(pz)2(H2O)2]PdCl4.4H2O tends to be diamagnetic with a magnetic moment of 1.47 BM.